Walking beam swivel



Dec. 6, 1932. R. c. BAKER 1,890,208

WALKING BEAM SWIVEL Filed Jan. 21. 1930 ATTORNEYS- Patented Dec. 6, 1932 z -s: we

l he

UNETEE) REUBEN C. BAKER, OE COALINGA, CALIFGRNIA, ASSIGNOH TO BAKER OIL TOOLS, INC

OF HUNTINGTON PARK, (IA"IEGRI IIA,A CORPORATION OF CALIFORNIA TALKING BEAM SWIVEL Application filed January 21, 1930. Serial No. 422,353.

This invention relates to apparatus to be used in connection with deep well equipment and more particularly pertains to an improved type of walking beam swivel.

In my co-pending applications entitled Pitman bearing, Ser. No. li 3,352, iiled J an. 21, 1930, and Counter-balanced pitman, Ser. No. 422,355, filed Jan. 21, 1930, l have shown novel means for handling a counterweighted pitman. In these applications I have shown a mechanism capable of supporting the counterweight and enabling the counterv-Je-ighted pitman to be easily removed from the crank pin without disconnecting the pitman from the walking beam. In order to accomplish this, the walking beam, which is supported at its center by a Samson post, must be capable of swinging in a horizontal plane. In common practice the walk lg bean must be able to oscillate in a vertical plane to transmit the reciprocal motion of the pitman at its one end to the pump rods attached to its other end.

Therefore, it is the principal object of the 1 present invention to provide an improved connection for walking beam and Samson post which enables the walls beam to oscillate both in a vertical and a horizontal plane,

\ which connection is capable of being secured against horizontal movement if desired while the walking beam is being need in its pumping operation.

One form which the invention may assume is exem )lified in the followina' descri tion and illustrated by way of example in the accompanying drawing, in which:

Fig. 1 is a side elevation part in section showing a preferred form of my inven 3 and certain structural. features thereof.

Fig. 2 is an end view of the same.

Fig. 3 is a plan view of the same.

Fig. 4- is a perspective view of an upper pivot plate which forms a part of this invention.

Fig. 5 is a similar view of a lower pivot plate.

Referring more particularly to the drawing and especially to 1 and 52, I show portions of a. Samson post and a walking beam 11. Fastened to opposite sides of the Samson post 10 by means of suitable bolts 12 are a pair of plates 14. The plates 14: extend upwardly beyond the top of the Samson post and support a. pair of trunnion bearings 15.v aps 16 are bolted to and form the upper halves of the bearings 15.

i A pair of trunnions 17 are formed integrally with and extend from opposite sides of a lower bearing plate 18. The trunnions 17 are journalled in the bearings so that the bearing plate 18 is free to rock or pivot about the axis of the trunnions.

An upper bearing plate 19 is fastened to the lower side of the walking beam 11 by means of suitable bolts extending through the holes 20 in the plate. The holes 20 are countersunk from the underside of the plate in order that the heads of the fastening bolts will be flush therewith. v

A hole 21 is formed in the center of the low-er bearing plate 18 and a hollow cylindrical boss 22 extends downwardly from the center of the upper bearing plate 19. lVhen the plates are placed together the boss 22 extends into the hole 21 and provides an axis about which relative movement of the two plates in a horizontal plane is possible. A pin lc 23 extends through the two plates and with the aid of a washer 24L and a nut prevents separation of the plates. 7

The top surface of the plate 18 and the bottom surface of the plate 19 are machined so that their relative motion will be opposed by a minimum of frictional resistance.

It will be seen that by a connection of the character described the walking beam ispermitted to oscillate in the usualmanner by means of the trunnions 17 and to rotate upon theSamson post in the manner and for the reasons set forth in my co-pending applications hereinbefore referred to. Obviously, however, the oscillatory and therotary movement are not in'some instances desired at the same time, so I have provided means where by the rotary movement may be prevented or permitted at will.

In Figs. 3 and 4 a pair of arcuate slots 25 are shown in the lower pivot plate 18. The arcuate slots 25 are common to the same circle, the center of which is also the center of the plate 18. Holes 26 formed in the upper bearing plate 19 communicate with the slots when the plates are placed together. Bolts 27 carried by the holes 26 in the upper plate extend through the slots 25 and are provided with nuts 28 at their ends.

In order to prevent rotary movement of the walking beam when it is being employed in its oscillating capacity, the nuts 28 are tightened upon the bolts 27 with the result that the pivot plates 18 and 19 are firmly pressed together and relative movement between them is prevented. When it is desired to rotate the walking beam, the nuts 28 are loosened whereby the upper plate 19 ,Which is fastened to the walking beam is allowed to rotate upon the lower plate 18 carried by the Samson post.

It is neither necessary nor desirable that the walking beam rotate through a complete circle and the length of the slots 25 serve to limit its rotary motion. When the bolts .27 reach the ends of the slots 25 further motion is prevented. 1

It is obvious from the. foregoing that I have provided a simple and durable connece tion for walking beams whereby both oscilla- .tory and rotary movement of a walking beam may be permitted relative to the Samson post upon which it is supported.

While I have shown the preferred form of my invention, it is to be understood that various changes may be made in its construction by those skilled in the art without departing from the spirit of the invention as defined in the appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent 1s:

a pair of trunnion bearings supported by the Samson post, a trunnion journalled in said bearings and supporting a pivot plate, and a second pivot plate fastened to the walking beam and rotatably mounted on the first pivot plate. 7

2. In combination with a well pumping rig including awalking beam and a Samson post, a pair of trunnion bearings supported bythe Samson post, a trunnion journalled in said bearings and supporting a pivot plate, a second pivot plate fastened to the walking beam and rotatably mounted on the first pivot plate, and means engaging the two pivot plates, said means being capable of preventing relative movement of the plates.

3. In combination with a well pumping rig including a walking beam and a Samson post, trunnion bearings on the Samson post, a trunnion supported in said bearings and supporting a pivot plate, a central downwardly extending hollow bearing member on said "pivot plate, a second pivot plate fastened to the walking beam, a hollow trunnion on'said sec- 1. In combination with a wellpumping rig including a walking beam and a Samson post,

REUBEN C. BAKER. 

